I was unsure if this was actually KaiShin or not. Though it was implied, Kid really does flirt with everyone, so I had to look at the genre up top. Very good by the way!

*cackles* Wicked! XD

Cuuute~

This is utterly hilarious. Screwing with Hakuba like that. And Shinichi help! Hahaha!

KYAAAH! As usual your writing is magnificent! I love this idea and I love how Shinichi was like "maybe some other time" OOOOOAAAAABJEHFJSGHFZKSG I LOVE IT WHEN THEY FLirt! I love how Hakuba was like AAAAAH inside XD

Cute :) This was a great one-shot. Keep up the good work.

I liked this, but it feels a bit awkward that you skipped the heist. I would've thought you'd make Hakuba go completely nuts by letting Shinichi and Kaito do... Something more I guess. It would be funny to have Shinichi dressing up as a second kid and then having them run around one after the other, making KID appear in every corner of the room, or something like that.
I don't really have anything else to say about your writing other than that it seems rushed. Your vocabulary is good, spelling and grammar is also good, so if you work a bit on expanding your stories just the slightest they'd be really good . The same kind of goes for yor other stories ;)
One last thing, if you change a scene, like you did in this story with the heist then the coffeshop afterwards, put something in between them. Either a line or some writers use simple things like;
X
Or;
...
That way you show your readers that there's a scene change. Otherwise it's a bit difficult for a reader to read, because we wouldn't realize it until after a few paragraphs or sentences and that could also be somewhat irritating for the reader.
You could also put in another paragraph in which you describe some of what Shinichi did during the heist and how he ended up in the coffeshop. I think this is what you tried to do, but it didn't exactly come across as that. Shinichi was settling in because he didn't have to run around to catch and then bam! The heist was suddenly over without any explanation whatsoever on how it ended or even how it went.
Phew, I hadn't exactly planned to write such a long review .; I always try to put in constructive critisism, combined with good point on the writer's writing. I hope this is useful to you!

Hehe. Funny. Looking forward to more!